add nk_io at24_eeprom driver

hc

2023-02-14 796a7ef0befd21e25c2b9e42f53a6d7a4421941d

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ifeq ($(CONFIG_CPU_ARM926EJS),y)
PLATFORM_CPPFLAGS += $(call cc-option,-mtune=arm926ejs,)
endif
 
ifeq ($(CONFIG_CPU_V7),y)
ifndef CONFIG_SPL_BUILD
ALL-y    += u-boot.img
endif
endif